/Engine/Source/Editor/CurveEditor/Public/SCurveEditorView.h
Get it for just one curve
void GetCurveDrawParam ( [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FCurveEditor](API\Editor\CurveEditor\FCurveEditor) > & CurveEditor, const [FCurveModelID](API\Editor\CurveEditor\FCurveModelID) & ModelID, [FCurveModel](API\Editor\CurveEditor\FCurveModel) * CurveModel, double InputMin, double InputMax, [FCurveDrawParams](API\Editor\CurveEditor\FCurveDrawParams) & OutDrawParam ) const